Physics
Which of the following is preferred for accelerating electrons?

Betatron
Synchrotron
Van de Graft Generator
Cyclotron

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Below a certain minimum value depending on amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail

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Physics
The blue colour of sky is due to

Scattering of longer wavelengths of sunlight in the atmosphere
Refraction of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Reflection of sunlight

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